You're not fooling me. 你骗不了我. You are bluffing. 你在虚张声势.
You're just spinning a tale. 你只是在捏造故事. You're making up stories. 你在编故事.
It's a cooked-up story. 这是一则虚构的故事. One lie leads to another. 一次谎言, 引发别的谎言. Don't cry wolf or when you're really in trouble, no one will believe you. 不要骗人说你有麻烦, 要不然真碰上麻烦时, 没人相信你. You're not a very good liar. 你说谎的技术并不高明. He made up some cock and bull story . 你编造了些胡说八道的理由.